minecraft 1.6 snap shot bug: horse spawn egg

when i went to the minecraft snap shot i made a horse stable with all the stuff like horse armor and horse spawn eggs. when i went back to my normal minecraft a went to the chest to check it and the spot where the horse egg was like a wolf spawn egg but it said "spawn" i acted like it was a spawn egg and tried to spawn what ever it was but nothing happened and that was wierd because i was in the normal minecraft on the same world so ya. sencerly: xXTNT_DudeXx